CN218810909U - Reuse treatment system for crystal processing wastewater - Google Patents

Abstract

The utility model relates to the technical field of crystal processing wastewater treatment, and discloses a recycling treatment system for crystal processing wastewater, which comprises a grid device, a grit chamber, a water collecting well, a pre-settling tank, an adjusting tank, a coagulation reaction tank, a primary settling tank, a biochemical section, a secondary settling tank, an intermediate water tank, a V-shaped filter tank and a recycling water tank which are sequentially connected and arranged through a sewage pipe along the wastewater flowing direction; the A/O section comprises a hydrolysis acidification tank, an anoxic tank and an aerobic tank which are sequentially connected, wherein the anaerobic tank is connected with a water outlet of the upstream primary sedimentation tank, and the aerobic tank is connected with an inlet of the downstream secondary sedimentation tank. The utility model discloses a quartzy processing waste water retrieval and utilization processing system through with multistage physical separation, add medicine coagulating sedimentation and biochemical treatment and combine together, can effectively reduce solid suspended solid content in the quartzy processing waste water, can reduce to 10mg/L by 6000mg/L, COD content also can be reduced to below 100mg/L by 2000mg/L, satisfies 100% retrieval and utilization requirement, and waste water treatment volume is big moreover, and overall treatment cost is low.

Description

Reuse treatment system for crystal processing wastewater

Technical Field

The utility model relates to a quartzy processing waste water treatment technical field, concretely relates to quartzy processing waste water's recycling treatment system.

Background

The crystal processing industry is one of the post industries in Pujiang county of Zhejiang province, but the crystal also generates a large amount of pollutants such as waste water and waste gas in the processing process. The crystal processing wastewater mainly comes from the processes of grinding and polishing crystal and cleaning crystal balls. Different from general urban sewage, the crystal processing wastewater contains a large amount of carborundum, glass slag and the like, the concentration of suspended matters is very high and can reach 6000mg/L, the water quality and the water quantity change greatly, the pH range is 3-10, and the proportion of microorganism nutrient elements is disordered. At present, the common method for treating crystal processing wastewater is to add drugs for precipitation, and the precipitated wastewater is directly recycled. But actually, the quality of the wastewater after the drug addition precipitation is poor, the wastewater cannot be completely recycled, and the reuse rate of the wastewater is low.

Chinese patent CN103539278A discloses a method and apparatus for treating crystal grinding wastewater, which comprises subjecting crystal processing wastewater to primary filtration, primary precipitation, secondary precipitation, and ultrafiltration. The process avoids drug treatment, and can realize large-scale recycling of wastewater by treating wastewater by using an ultrafiltration membrane device made of specific materials after multiple times of precipitation.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a quartzy processing waste water's retrieval and utilization processing system can realize quartzy processing waste water's basic 100% retrieval and utilization, and waste water treatment capacity is big moreover, and processing cost is low.

The utility model provides a following technical scheme:

the system comprises a grid device, a grit chamber, a water collecting well, a pre-settling tank, an adjusting tank, a coagulation reaction tank, a primary settling tank, a biochemical section, a secondary settling tank, an intermediate water tank, a V-shaped filter tank and a reuse water tank which are sequentially connected and arranged through a sewage pipe along the flowing direction of wastewater;

the biochemical section comprises a hydrolysis acidification tank, an anoxic tank and an aerobic tank which are sequentially connected, wherein the hydrolysis acidification tank is connected with a water outlet of the upstream primary sedimentation tank, and the aerobic tank is connected with an inlet of the downstream secondary sedimentation tank.

The utility model discloses a quartzy processing waste water retrieval and utilization processing system to the characteristics of quartzy processing waste water high solid miscellaneous content and low BC value, combines together physics filtration, medicine deposit and biological treatment. The method comprises the steps of firstly, arranging a grid at a water inlet end to separate floating objects with large particle sizes, particularly filamentous and strip-shaped floating objects in wastewater, then naturally settling suspended matters in the wastewater by using a grit chamber, and removing inorganic particles with large specific gravity, so that the abrasion of the inorganic particles on a water pump and a pipeline is reduced, the blockage of a subsequent structure and the reduction of the volume of a sludge treatment structure are prevented, meanwhile, inorganic matter components in activated sludge can be reduced, and the activity of the activated sludge is improved. The wastewater automatically flows into a water collecting well, then is further sent into a pre-settling tank for deep separation, suspended matters which are not removed in a grit chamber are removed, the wastewater is prevented from depositing in an adjusting tank to influence subsequent treatment, the water quality and the water quantity of the wastewater are adjusted by combining the adjusting tank, the influence of impact load on subsequent treatment structures is reduced, then the wastewater is sent into a coagulation reaction tank for adding chemicals for flocculation and precipitation, colloid and fine suspended matters which are in a suspension state are agglomerated into particles which are easy to precipitate and separate, and chromaticity, inorganic pollutants, organic pollutants and the like can be partially removed; then utilize the characteristics that the suspended solid is heavier than water to make the suspended solid tentatively follow the aquatic separation through the preliminary sedimentation pond, be convenient for follow-up biochemical treatment, utilize the hydrolysis of hydrolysis-acidification pool just to turn into the organic matter of easily degrading with the difficult degradation organic matter in the waste water after that, improve the B/C of waste water, can realize denitrogenation in the oxygen deficiency pond, prevent the inflation of filamentous fungus simultaneously, then organic matter is oxidized and decomposes in the good oxygen biochemical pond, the heavy pond mud-water separation of rethread secondary sedimentation, set up middle pond behind the secondary sedimentation pond, guarantee the even stability of follow-up treatment, then through the V type filtering pond, further get rid of solid suspended solid SS, it carries out the retrieval and utilization to go out water. Therefore the utility model provides a processing system handles the back, and the pH value of intaking can be handled to 6 ~ 9 by 3 ~ 10, and chemical oxygen demand COD is less than or equal to 2000mg/L can reduce to COD and is less than or equal to 100mg/L, and more importantly suspended solid SS content can be reduced to below 10mg/L by 6000mg/L, satisfies the retrieval and utilization requirement completely, combines the tradition to add medicine simultaneously and handles and biological treatment, the waste water treatment requirement of adaptable different quality of water, and it is big to handle the total amount moreover.

As the utility model discloses a preferred, recycling system still includes the mud tank, the preliminary sedimentation pond, just sink pond, two heavy ponds and pass through sludge pipe and mud tank entry linkage respectively, be equipped with the sludge pump to mud tank transport mud on the sludge pipe. The sludge storage tank stores the precipitated sludge in the pre-settling tank, the primary settling tank and the secondary settling tank, sludge concentration is carried out, the volume of biochemical sludge and physicochemical sludge is reduced, and convenience is brought to subsequent treatment and disposal.

As the utility model discloses a preferred, through the sludge piping connection between two heavy ponds and the hydrolysis-acidification tank, be equipped with the sludge pump that flows back the mud in two heavy ponds to hydrolysis-acidification tank on the sludge pipe. And the sludge activity in the hydrolysis acidification tank is improved by utilizing the sludge reflux of the secondary sedimentation tank.

As the utility model discloses a preferred, recycling system still includes the air-blast device, the bottom in good oxygen pond and equalizing basin is equipped with aeration equipment respectively, the air-blast device is connected through aeration equipment in air hose and good oxygen pond, the equalizing basin. Sufficient air is provided for the aerobic tank and the regulating tank, and the water quality is fully regulated.

As the optimization of the utility model, the coagulation reaction tank, the primary sedimentation tank, the hydrolysis acidification tank, the aerobic tank and the V-shaped filter tank are respectively connected with the inlet of the water collecting well through the vent pipe. Thus, the wastewater at the bottoms of a plurality of positions is collected into the water collecting well to be re-collected and mixed, and then enters the recycling system again for treatment, so that the complete treatment of the wastewater is realized.

As the optimization of the utility model, the coagulation reaction tank comprises a pH adjusting tank and a plurality of flocculation tanks which are connected in sequence, a pH dosing system connected with the pH adjusting tank and a flocculating agent dosing system connected with the flocculation tanks; the pH adjusting tank is connected with a water outlet of the adjusting tank, and the flocculation tank at the tail end is connected with the primary sedimentation tank. The pH value of the wastewater is adjusted to a proper range by the pH adjusting tank and then is sent to the coagulation reaction tank.

As the utility model discloses a preferred, reuse water bottom of the pool portion and V type filtering pond bottom are still through the sewage union coupling that can flow back to V type filtering pond, be equipped with the backwash pump on the sludge pipe. And washing the sand layer of the V-shaped filter tank by using clean water in the reuse water tank to recover the filtering function of the V-shaped filter tank.

As the optimization of the utility model, the bottom of the V-shaped filter tank is provided with double-layer packing, which comprises a coarse quartz sand layer positioned at the bottom and a fine sand layer positioned on the coarse quartz sand layer;

the thickness of the fine sand layer is larger than that of the coarse quartz sand layer;

the grain diameter of sand in the fine sand layer is 0.9-1.2 mm, and the nonuniform coefficient K80= 1.2-1.4;

the grain size of the sand in the coarse sand layer is 2-4 mm. Through the cooperation of the fine sand layer and the coarse sand layer, the suspended solid is filtered by the fine sand layer and then deposited in the coarse sand layer, so that the suspended solid is effectively separated from the supernatant wastewater.

As the utility model discloses a preferred, retrieval and utilization processing system still includes emergent pond, the sump pit is connected with emergent pond through the sewage pipe, emergent pond is connected through sewage pipe preliminary sedimentation pond. The discharged wastewater can be temporarily stored in a sewage treatment facility under special conditions of accidents, maintenance and the like.

As the optimization of the utility model, the bottom of the emergency pool is also provided with an aeration device.

The beneficial effects of the utility model are as follows:

the utility model discloses a quartzy processing waste water retrieval and utilization processing system through with multistage physical separation, add medicine coagulating sedimentation and biochemical treatment and combine together, can effectively reduce solid suspended solid content in the quartzy processing waste water, can reduce to 10mg/L by 6000mg/L, COD content also can be reduced to below 100mg/L by 2000mg/L, satisfies 100% retrieval and utilization requirement, and waste water treatment volume is big moreover, and overall treatment cost is low.

Drawings

Fig. 1 is a process flow diagram of the recycling system of the present invention.

Fig. 2 is a structural view of the V-shaped filter.

In the figure, 1, a grid ditch, 2, a grit chamber, 3, a water collecting well, 3.1, a submersible pump, 4, a pre-settling tank, 5, an adjusting tank, 6, a coagulation reaction tank, 6.1, a pH adjusting tank, 6.11, a paddle type stirrer, 6.12, a lime dosing system, 6.13, a sulfuric acid dosing system, 6.14, a PAC dosing system, 6.2, a flocculation tank, 6.21, a frame type stirrer, 6.22, a PAM dosing system, 7, a primary settling tank, 8, a biochemical section, 8.1, a hydrolysis acidification tank, 8.11, a packing layer, 8.12 and an N/P dosing system, 8.2, an anoxic tank, 8.21, a submersible mixer, 8.3, an aerobic tank, 9, a secondary sedimentation tank, 10, an intermediate water tank, 11, a V-shaped filter tank, 11.1, a coarse sand layer, 11.2, a fine sand layer, 12, a reuse water tank, 12.1, a backwashing pump, 13, a sludge storage tank, 13.1, a dehydrator, 14, a blower, 15, a sludge pump, 16, a sewage pump, 17, a microporous aerator, 18, a mud scraper, 19, a sewage pipe, 20, a sludge pipe, 21, an air pipe, 22, an emptying pipe, 23, an emergency water tank, 24 and a perforated aeration pipe.

Detailed Description

The following further describes the embodiments of the present invention with reference to the drawings.

As shown in fig. 1, a recycling treatment system for crystal processing wastewater comprises a grid channel 1, a grit chamber 2, a water collecting well 3, a pre-settling chamber 4, an adjusting tank 5, a coagulation reaction tank 6, a primary settling chamber 7, a biochemical section 8, a secondary settling chamber 9, an intermediate water tank 10, a V-shaped filter tank 11, a recycling water tank 12, a sludge storage tank 13 for collecting sludge and an air blower 14 for providing air aeration, wherein the waste water is sequentially connected and arranged along the flow direction of wastewater through a sewage pipe 19, the sludge storage tank is provided with a dehydrator 13.1 at the downstream, so that the sludge in the sludge storage tank is delivered outside after being dewatered, wherein:

the grit chamber 2 is used for removing inorganic particles with larger specific gravity, and the bottom of the grit chamber is provided with a plurality of straight-wall parallel channels for preventing sediment from flowing along with water flow at the bottom and the effluent of the grit chamber automatically flows into a water collecting well;

the water collecting well 3 is used for collecting and temporarily storing sewage, a submersible pump 3.1 is arranged in the water collecting well, and the submersible pump conveys the sewage in the water collecting well to the pre-settling tank 4 through a sewage pipe;

the preliminary sedimentation tank 4 is connected with a sludge storage tank through a sludge pipe 20, and a sludge pump 15 for conveying sludge to the sludge storage tank is arranged on the sludge pipe; the effluent of the pre-settling tank automatically flows into an adjusting tank 5; an emergency pool 23 is also arranged between the pre-settling tank 4 and the water collecting well, the emergency pool is respectively connected with the upstream water collecting well and the downstream pre-settling tank through sewage pipes, and the bottom of the emergency pool is provided with a perforated aeration pipe 24 which is connected with a blower through an air pipe;

the bottom of the adjusting tank 5 is provided with a perforated aeration pipe 24 which is connected with the blower 14 through an air pipe 21; the effluent of the regulating reservoir is conveyed into the coagulation reaction tank 6 through a sewage pump 16 and a sewage pipe;

the coagulation reaction tank 6 comprises two pH adjusting tanks 6.1 and two flocculation tanks 6.2 which are connected in sequence; a paddle stirrer 6.11 is arranged in the pH adjusting tank, the upstream of the pH adjusting tank is also connected with a lime dosing system 6.12, a sulfuric acid dosing system 6.13 and a PAC dosing system 6.14, wherein the lime dosing system 6.12 and the sulfuric acid dosing system 6.13 are connected with a first pH adjusting tank, and the PAC dosing system 6.14 is connected with a second pH adjusting tank which is next to the first pH adjusting tank; a frame type stirrer 6.21 is arranged in the flocculation tank, and a PAM dosing system 6.22 is connected to the upstream of the second flocculation tank 6.2; the bottoms of the pH adjusting tank and the flocculation tank are connected to the bottom of the water collecting well through an emptying pipe 22; the effluent of the second flocculation tank enters a primary sedimentation tank 7 through a sewage pipe;

the bottom of the primary sedimentation tank 7 is connected with a sludge storage tank through a sludge pipe and is connected with a water collecting well through an emptying pipe 22, a sludge pump for conveying sludge to the sludge storage tank is arranged on the sludge pipe, and a sludge scraper 18 is arranged in the primary sedimentation tank; the effluent of the primary sedimentation tank enters a biochemical section 8;

the biochemical section 8 consists of a hydrolytic acidification tank 8.1, an anoxic tank 8.2 and 4 aerobic tanks 8.3 which are connected in sequence; the hydrolysis acidification tank is connected with a water outlet of the upstream primary sedimentation tank and is used for receiving the effluent of the primary sedimentation tank; a packing layer 8.11 is arranged in the hydrolysis acidification tank; the upstream of the hydrolysis acidification tank is also connected with an N/P dosing system 8.12; the effluent of the hydrolysis acidification tank enters an anoxic tank 8.2 for denitrification, and a submersible stirrer 8.21 is arranged in the anoxic tank; the effluent of the anoxic tank sequentially enters 4 aerobic tanks 8.3, and the aerobic tanks are internally provided with microporous aerators 17 which are connected with an air blower 14 through air pipes 21; the bottom of the aerobic tank and the bottom of the hydrolysis acidification tank are respectively connected to the bottom of the water collecting well through an emptying pipe 22; the effluent of the terminal aerobic tank enters a secondary sedimentation tank 9;

a mud scraper is arranged in the secondary sedimentation tank 9, the bottom of the secondary sedimentation tank is respectively connected with the hydrolysis acidification tank and the sludge storage tank through a sludge pipe, so that part of sludge in the secondary sedimentation tank is returned to the hydrolysis acidification tank for ensuring the sludge concentration of the biochemical tank, and part of sludge is conveyed to the sludge storage tank; the effluent of the secondary sedimentation tank is sent into an intermediate tank 10 through a sewage pipe;

the middle water tank 10 is used for adjusting the water quality, and the outlet water of the middle water tank is sent to the V-shaped filter tank 11 through a submersible pump and a sewage pipe;

the bottom of the V-shaped filter 11 is provided with double-layer packing, which comprises a coarse quartz sand layer 11.1 positioned at the bottom and a fine sand layer 11.2 positioned on the coarse quartz sand layer; wherein the sand grain diameter of the fine sand layer is 0.9-1.2 mm, the uneven coefficient K80= 1.2-1.4, the design is 1.3 in the embodiment, and the layer thickness is 1200mm; the grain diameter of the sand in the coarse sand layer is 2-4 mm, and the layer thickness is 200mm; the bottom of the V-shaped filter is also connected with a water collecting well through an emptying pipe, so that the emptied water at the bottom of the V-shaped filter can flow into the water collecting well; the effluent of the V-shaped filter tank is sent to a reuse water tank 12 through a sewage pipe;

the reuse water tank 12 is used for receiving the treated sewage, the water quality of the sewage reaches the standard, wherein COD is less than or equal to 100mg/L, SS is less than or equal to 10mg/L, the pH value is 6-9, and the sewage can be reused or discharged to a municipal pipe network; the bottom of the reuse water tank is also connected with the V-shaped filter tank through a sewage pipe, a back washing pump 12.1 is arranged on the sewage pipe, and the sand layer of the V-shaped filter tank is washed by using clean water in the reuse water tank to recover the filtering function of the V-shaped filter tank.

Claims (10)

1. A crystal processing wastewater recycling treatment system is characterized by comprising a grating device, a grit chamber, a water collecting well, a pre-settling tank, a regulating tank, a coagulation reaction tank, a primary settling tank, a biochemical section, a secondary settling tank, an intermediate water tank, a V-shaped filter tank and a recycling water tank which are sequentially connected and arranged through a sewage pipe along the flow direction of wastewater;

the biochemical section comprises a hydrolysis acidification tank, an anoxic tank and an aerobic tank which are sequentially connected, wherein the hydrolysis acidification tank is connected with a water outlet of the upstream primary sedimentation tank, and the aerobic tank is connected with an inlet of the downstream secondary sedimentation tank.

2. The crystal processing wastewater recycling treatment system according to claim 1, wherein the recycling system further comprises a sludge storage tank, the preliminary sedimentation tank, the secondary sedimentation tank are connected with the inlet of the sludge storage tank through sludge pipes, and a sludge pump for conveying sludge to the sludge storage tank is arranged on the sludge pipes.

3. The crystal processing wastewater recycling treatment system according to claim 1 or 2, wherein the secondary sedimentation tank and the hydrolysis acidification tank are connected through a sludge pipe, and a sludge pump for returning the sludge in the secondary sedimentation tank to the hydrolysis acidification tank is arranged on the sludge pipe.

4. The recycling treatment system of crystal processing wastewater as claimed in claim 1, further comprising a blower, wherein the bottom of the aerobic tank and the bottom of the regulating tank are respectively provided with an aeration device, and the blower is connected with the aeration devices in the aerobic tank and the regulating tank through an air pipe.

5. The crystal processing wastewater recycling treatment system according to claim 1, wherein the coagulation reaction tank, the primary sedimentation tank, the hydrolysis acidification tank, the aerobic tank and the V-shaped filter tank are respectively connected with the inlet of the water collecting well through an emptying pipe.

6. The crystal processing wastewater recycling treatment system according to claim 1, wherein the coagulation reaction tank comprises a pH adjusting tank and a plurality of flocculation tanks which are connected in sequence, and a pH dosing system connected with the pH adjusting tank and a flocculant dosing system connected with the flocculation tanks; the pH adjusting tank is connected with a water outlet of the adjusting tank, and the flocculation tank at the tail end is connected with the primary sedimentation tank.

7. The system of claim 1, wherein the bottom of the reuse tank is connected to the bottom of the V-shaped filter tank via a sewage pipe that allows the water to flow back to the V-shaped filter tank, and the sewage pipe is provided with a back-flushing pump.

8. The crystal processing wastewater recycling treatment system according to claim 1 or 7, wherein the V-shaped filter chamber is provided with double-layer packing, comprising a coarse quartz sand layer at the bottom and a fine sand layer on the coarse quartz sand layer;

the thickness of the fine sand layer is greater than that of the coarse quartz sand layer;

the grain diameter of the sand in the fine sand layer is 0.9-1.2 mm, the nonuniform coefficient K80= 1.2-1.4, and the layer thickness is 1100-1300 mm;

the grain diameter of the sand in the coarse sand layer is 2-4 mm, and the layer thickness is 150-300 mm.

9. The system for recycling and treating crystal processing wastewater of claim 1, further comprising an emergency pool, wherein the water collecting well is connected with the emergency pool through a sewage pipe, and the emergency pool is connected with the preliminary sedimentation tank through a sewage pipe.

10. The crystal processing wastewater recycling treatment system according to claim 9, wherein an aeration device is further provided at the bottom of the emergency pool.

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